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SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

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Subcommand Order<br />

Operations<br />

• Subcommands can be named in any order.<br />

ORTHOPLAN 1171<br />

• ORTHOPLAN builds a working data file if one does not already exist by using the variable<br />

and value information on the FACTORS subcommand.<br />

• When ORTHOPLAN appends to a working data file and FACTORS is not used, the factor<br />

levels (values) must be defined on a previous ORTHOPLAN or VALUE LABELS command.<br />

• New variables STATUS_ and CARD_ are created and added to the working data file by<br />

ORTHOPLAN if they do not already exist. STATUS_=0 for experimental cases, 1 for holdout<br />

cases, and 2 for simulation cases. Holdout cases are judged by the subjects but are not<br />

used when CONJOINT estimates utilities. Instead, they are used as a check on the validity<br />

of the estimated utilities. Simulation cases are entered by the user. They are factor-level<br />

combinations that are not rated by the subjects but are estimated by CONJOINT based on<br />

the ratings of the experimental cases. CARD_ contains the case identification numbers in<br />

the generated plan.<br />

• Duplication between experimental and simulation cases is reported.<br />

• If a user-entered experimental case (STATUS_=0) is duplicated by ORTHOPLAN, only one<br />

copy of the case is kept.<br />

• Occasionally, ORTHOPLAN may generate duplicate experimental cases. One way to<br />

handle these duplicates is simply to edit or delete them, in which case the plan is no longer<br />

orthogonal. Alternatively, you can try running ORTHOPLAN again. With a different seed,<br />

ORTHOPLAN might produce a plan without duplicates. See the SEED subcommand on<br />

SET in the SPSS Base <strong>Syntax</strong> <strong>Reference</strong> Guide for more information on the random seed<br />

generator.<br />

• The SPLIT FILE and WEIGHT commands are ignored by ORTHOPLAN.<br />

Limitations<br />

Example<br />

• Missing data are not allowed.<br />

• A maximum of 10 factors and 9 levels can be specified per factor.<br />

• A maximum of 81 cases can be generated by ORTHOPLAN.<br />

ORTHOPLAN FACTORS=SPEED ’Highest possible speed’<br />

(70 ’70 mph’ 100 ’100 mph’ 130 ’130mph’)<br />

WARRANTY ’Length of warranty’<br />

(’1 year’ ’3 year’ ’5 year’)<br />

SEATS (2, 4) /MINIMUM=9 /HOLDOUT=6 /OUTFILE=’CARPLAN.SAV’.

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